With the CAB-2, you activate the Refueling Sequence by pressing AUX1, then pressing and holding "0" for several seconds. Doing the same thing on the ENG screen of the iCab app, all I get is a horn blow. Am I doing something wrong, or is the Refueling Sequence unavailable on the iCab app? (Current Fuel Level is readily activated on the iCab app via a dedicated button on the dialogue screen.)
By the way, my iCab app is v2.0x32.